Brake for winding drums



`uly 31,1934. R. E. KLINE BRAKE FOR WINDING DRUMS Filed May 21, 1929 3Sheets-Sheet 1 En E W WNW; NW w jm; l l :whim m NN U --\1| NNI NNN l MlmHMI@ v www? Nxl\ l @nl @Nl Q mm1 i A mm1 QN ||F m@ QN w f .NUMA Nwwv EWN ||I @mx NKY .r .MMX @N ,h m@ m m www o. WN .IIIWQN l. h f2, mw .EMN

July 31, 1934. R. E. KLINE l BRAKE FOR WINDING DRUMS Filed May 21, 19293 Sheets-Sheet 2 Jul/ 31, 1934. R. E. KLINE 1,968,210

BRAKE FOR WINDING DRUMS Filed May 21, 1929 3 Sheets-Sheet 3' JMU/f? eg.

Patented `Iuly 31, 1934 1,968,210 BRAKE Fon -WINDING DnUMs PATENT@maeffiRichard .'E. K lin'e, Los Angeles, Calif;, assignolgu l v by mesneassignments, to OilWell Supply Company, Pittsburgh, Pa., yavcorporationof New f i Y Jersey Application May 21,1929; seriarnofsemasThis invention hasto do generallywith brake devices, andA relatesk moreparticularly to drum brakes vespecially adapted foruse onwin'ding drumsfor hoists', 'draw-Works, oil drilling equipment', or the like. Thebrake structure embodied in thefinvention is Vdesigned primarily withtheView of providing for winding drums,l and other devices including thecombination of arotatabledrum and a brake band around y'the' drum, ahighly effective means fortensioning the brake band about the drumarranged in a manner such'as to apply a portion of the band as a brakeshoe. A further object of my invention' is to "permit maximum brake areaoi `the b an'dto beutilized.' The invention is characterized primarilyby the particular manneriin which theband'is applied to the drum ineffecting the braking action, this manner being such that the bandnotonly isbroughttobear tightly against `the drumbut, in addition, tobejtensionedfin, the direction of rotation of the drurnin such a waythat the drum itselfaids in tensioning the band. The :band is applied tothe drum in such away that Aits bear# ing surface or lining is subjectedto even Wear; and as a vprovision for preventing unnecessary wear "ordragging whenV not in use, tlie'jband is maintained out o feng agementwith the drum when thebrake idles.'v Y s j.

In orderrto accomplish effective. brake action in the manner describedJhave provided at the movableor fr eeend of 'the' band, the other end ofthe band being normally held. stationary, a toggle connection withsuitable actuating means. As a result of the action ofv the toggle,ftheband not only is vdrawn circumferentially'-about the drum, but thefree' end ofthe-band 'is urged against the' :drum with suiiicient force'to cause said free end to 'be irictionally .held bythe drum, thelatter, by virtue of itsV rotation, drawing the band 'tightly aboutitself. Thefparticular con'- struction and operation oithey invention`will be understood most readily .and clearly from the following detaileddescription, reference being had throughoutthe description to theannexed drawings, in'which: .v l

l is a front elevation of a conventionally illustrated drumequipped withthe present brake device;` r' H Fig-2 is 'ani-"enlarged left lendelevation of Fig. l, the brake being shown in released' posilEig. 311sak view similar toaFig. 2- showingthe brake applied .to-theY drum;

brake band. It will beiapparent that,withthe s a resting against theFig. 4is an lenlarged fragmentary View of a bandanchor post; and

Fig. 5j is a part elevational and a-part sectional view taken on theybrokenlinefof Fig. 3. 1n the preferred embodiment of my invention andas'shown 'in the drawings; the brake means are shown in duplicate,although it will be undere stood lthat a single brake means maybe'applied to numerous types of drums'other thanthe one 'shown. 'vf' InAthe drawin'gsa horizontally disposedwindy ing drum 10 is employed. Thisdrum is supported by mearsfof @Suitable framework, the vf.1afif1v0lincluding upright-,s Y11 interconnected by means of the crossmember 11a.',TrunniQns-12 Aof the drum are j'ournaled in bearings 13 mounted on theuprightsand the drumfis adapted to berotated bysuitable' drivemeans, forinstance, the coni/ erii tionally illustrated geardrive 14. Drum'lO i spr'vv videdwith enlargedj`cylindricalends or brake flanges 10a, eachconstituting a brake drum and provided with brake bands 15. i -'Asfshown in Fig. 2, the brake b and' 15 lbastan integral lining 15a andits end 16 is pivotallyfanchored by vmeans of a 'vertically adjustablepost 1'7. (The free end l8"of the bandisjireeto move circumferentiallyabout thedrum and Yis v'connected to the brake operating lever 19throughthe toggle mechanism, generally indicated at 20. jThe bandisyieldably supported at anA intermediate point 21'from the frame crossmember 11a by means of the Aspring suspension 2 2. This suspensiondevice embodies a strip 2 3 suspended# from saidcro'ss member,a'tube'24- carried by the strip, and through whichthe shank ofv ahook25' eX- tends. 'Tube 24 carries va spring126',and 2'7-is avertically movable washer in the tube resting onthe upper end of thespring to enable'the spring to vyieldably supporthook 25 and,thereforathe brake releasedv as in Fig/2,v the band is raised frompositiononthe rbrake-drum orflange by means ofthedevice 22, Ytherebypreventing undue .wear'of the lining 15er'.Y As will later beseen, whenthe toggle' device 2 0is in releasedfposition, there 100 is noappreciable bearing of the brake bands drum around its lower periphery@Aj As previouslymentioned, the fixed end 1 6 ofthe bandisfpivotallyfanchoredto the upper. end "of post 17. As illustratedthejoint therebetween eml 4a horizontal pin 2 8 releasably held jby"s'et screw 29 in thev enlarged head 17a ofthe post', the 'center of theband'being 'out away to'receivesaid head portion andl'ooped toform eyes:through which pin"28 extends. The lower end of the v`post 1'10 iscontained within a vertical sleeve 30, the latter having an annularflange 30a on its lower end disposed within an opening 31 formed in theunder face of a block 31a. The sleeve is held in the block againstvertical displacement, and the latter in turn is secured to the platformor oor F by means of bolts 32. The post is threaded through a nut 33,integral with the upper end of the sleeve, and is held in verticallyadjusted position by means of a lock nut 33a. Thus, by having the postadjustable as described, the free end 16 of the band may be positionedas desired relative to the toggle 20, thereby providing for regulatingthe thrust of the toggle in urging theb-and radially against thebrake-drum. l

The brake operating lever 19 as illustrated is integral with ahorizontally extending crank shaft 19a, the latter extendingsubstantially parallel,

with the axis A of the drum and preferably near the base of the sleeves30. As particularly shown by Fig. 1, the crank shaft extends the lengthof the drum 10, and, as will later be seen, serves to simultaneouslyactuate the brakes by tensioning the brake bands on each of the brakeflanges 10a This shaft is journaled at its respective ends in saddleboxes 35 bolted to the floor F, and has crank arms 18h, one pairdesigned for cooperation with each of the toggles 20. Each pair of crankarms comprises one element of the toggle, an offset pivot in the form ofa pin 36 being carried by each pair of crank arms to constitute a togglejoint.

A plate 37 is fastened on the free end of the ,ba-nd 15 and is shaped oneach side to provide a pair of oppositely disposed bosses 37a drilled toreceive pin 38. A link 39 is pivotally connected to plate 37, the arm39a of the link terminating in bosses 39h drilled to receive the pivotpin 38. The link is also pivotally connected to the offset crank ,pin 36by means of a removable strap 40 extending around said pin and securedto the link by bolts 4l.

It will be seen that by anchoring the fixed end of the brake band at apoint P substantially in vertical tangential alinernent with the drum,and with the free end of the band terminating at a point intermediatethe bottom B of the drum and the point P of tangency of said xed end,said free end, by positioning the crank shaft near the collar or sleeve30, may closely approach the xed end. Thus, the band practicallysurrounds the .drum with the advantage that maximum brake area isprovided.

It is assumed the direction of rotation of the drum is that indicated byarrow R and that the toggle, through lever 19, is moved from theposition of Fig. 2 to that of Fig. 3. Because of the characteristics ofthe toggle action, the free end of the band is caused not only to movecircumferentially relative to the drum in the direction of Vrotationthereof, but also to be urged radially irrward against the drum withsucient force to frictionally engage the drum. Obviously, the frictionalengagement of the free end-of the band with the drum serves to cause theband to be tightly drawn throughout its extent into engagement with thedrum, and against the `tension of .the suspension device 22, by virtueof the rotational force of the drum. In addition, one component of thethrust imparted by the toggle is tangential to the drum. By thus makinguse of y the momentum of the drum in tensioning the vbrake band, thelatter obviously may be tensioned to a much greater degree than would bepossible by mere tangential thrust alone on the free end of the band.

As previously mentioned, the effect of the toggle in producing radialthrust of the band against the drum may be varied by verticallyadjusting post 17 and, therefore, end 16 of the band, the eifect beingthat the position of the latter relative to the drum is changed, andthat the position of link 39 is varied accordingly. Thus, assuming post17 to be lowered, the free end of the band moves about the drum in thedirection of arrow S and the link 39 is swung counter clockwise. It willbe apparent that by actuating the toggle in this position, the radialthrust imparted to the band through said link is increased by virtue ofthe adjustment and that the frictional engagement of the band with thedrum is correspondingly increased, the result being that addedrotational force of the drum is harnessed in tensioning the bands. Byraising instead of lowering the post, added tangential thrust of theband by the toggle obviously is effected at the expense of its radialthrust.

Upon releasing the brake to such positions that the band extends looselyabout the drum, the intermediate portion of the former is raised fromengagement with the drum by virtue of the action of spring device 22,thus preventing wear of the brake lining. The lower portion of the bandis sufliciently released from engagement with the drum to preventdragging and unnecessary wear of the lining when the brake idles.

It will be understood that the drawings and description are to beconsidered merely as illustrative of and not vrestrictive on the broaderclaims appended hereto, for various changes in design, structure andarrangement may be made without departing from the spirit and scope ofsaid claims.

I claim: C

1. A brake device comprising a rotatable brake drum, a brake band forthe drum, anchoring means for one end of the band, said anchoring meansbeing adjustable to permit shifting of the band circumferentially aboutthe drum, and operating means joined to the free end of said band, saidmeans comprising a link freely pivoted between the band and saidoperating means and arranged within the angle between the brake band anda line normal thereto at the pivot between the link and the band so thata pushing force on said link is transmitted to said band with radial andtangential components, and means for applying a pushing force to thelink to tension the band around the drum.

2. In a device of the character described, the combina-tion of arotatable brake drum, a brake band surrounding Vsaid drum, anchoringmeans for one end of the brake band, said anchoring means beingrelatively stationary during actuation of the brake band, and operatingmeans joined to the free end of said band comprising a pushing elementpivoted to the brake band and arranged within the angle between thebrake band and a line normal thereto at the pivot of the pushing elementand the band to apply a pushing force having a component toward thebrake drum, and means for pushing said element, said anchoring meansbeing adjustable to permit shifting of the band circumferentially aboutthe drum to vary the angle of incidence of the pushing force.

3. In a device' of the character described, the combination of arotatable brake drum, a brake band surrounding said drum, .operatingmeans for the brake band, and ia relatively stationary support for saidoperating means, one end of said brake band being anchored to saidsupport, said operating means comprising a crank shaft rotatably mountedon said support and a link connecting a crank of the crank shaft and thefree end of said band, said link being arranged within the angle betweenthe brake band and a line normal thereto at the pivot of the link andthe band.

4. A brake device comprising a rotatable brake drum, a'brake bandsurrounding said drum, a vertically adjustable post for anchoring oneend of the brake band, a spring for freeing the band from said drum whenthe band is released and operating means pivoted to the free end of saidband, said means comprising a crank shaft, a link pivoted to a crank ofthe crank shaft and pivoted to the free end of said band, said linkbeing ar-Y ranged within the angle between the brake band and a linenormal thereto at the pivot between the link and the band, and means forrocking saidl crank shaft.

5. In apparatus of the character described, a horizontal rotatable drum,a brake band for said drum, adjustable anchoring means for one end ofsaid band arranged in upward tangential alignment with the drum, a freeend of the band terminating at a point intermediate the bottom of thedrum and the point of tangency of said fixed end, actuating means forsaid brake band and a link pivoted freely between the free end of saidband and a. moving part of said actuating means within the angle betweenthe brake band and a, line normal thereto at the pivot point of the linkand movable freely between said moving part and said end of said band totransmit to said band end a pushing force having radial and tangentialcomponents.

RICHARD E. KLINE.

